John lawrence



(No Model.)

. J. LAWRENCE. DEVICE FOR STOPPING LEAKAGE IN HOSE OR OTHER PIPES.

No. 454,279. Patented June 16, 1891.

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UNITED STATES PATENT OFFICE.

JOHN LAIVRENCE, OF UOKFIELD, ENGLAND.-

DEVICE FOR STOPPING LEAKAGE IN HOSE OR OTHER PIPES.

SPECIFICATION forming part of Letters Patent No. 454,279, dated June 16,1891.

Application filed November 26, 1888. Serial No. 291,935- (No model.)Patented in England August 25, 1888, No. 12,278, and in Germany June5,1889,No.4'7,230.

To all whom it may concern.-

Be it known that I, JOHN LAWRENCE, a subject of the Queen of GreatBritain, residing at Uckfield, in the county of Sussex, England, haveinvented a certain new or Improved Device for Stopping Leakage in Hoseand other Pipes, (for which I have previously obtained Letters Patent inGreat Britain, dated August 25, 1888, No. 12,273, and in Germany, No.47,230, dated June 5, 1889,) of

which the following is a full,'clear, and exact,

and of sufficient thickness to resist the pres s ure exerted by theliquid which projects with force from the leakage. This india-rubbercylinder is inclosed in another cylinder, of

- iron, steel, or other suitable metal, made of two parts or halveshinged together at the rear or made integral, of flexible material, andprovided at their front edges with vertical bars furnished with tappedholes, in which are screwed one or more pairs of handles; or I may usefor inclosing the india-rubber cylinder a continuous sheet of flexiblesteel; or, again, I may rivet vertical bars such as above mentioneddirectly to the india-rubber cylinder and fix handles thereto. The saidhinged plate or flexible sheet metal is provided with a flange formed onits outer edges and cut away in parts for the passage of straps whichoverlap one another when the device is closed, and thus press the edgesof the india-rubber inwardly.

In order that my invention may be more fully understood, I have shownthe same in the accompanying drawings, in which- Figure 1 is a plan ofmy improved device, Fig. 2 being an elevation of the same in a closedposition, and Fig. 3 being a sectional view of one handle and itssocket.

A is the india-rubber split cylinder, over which is placed a sheet offlexible steel S, (or as the case may be a cylindrical casing composedof two curved plates hinged at the back,) Whose edges are furnished withtwo flanges ff, by the side of which are formed, shrunk,

riveted, or screwed two vertical bars B B,

each bar being provided with one or several (one only is shown in thedrawings) tapped perforations p p, in which are screwed the handles ith. The flanges ff are cut off at c c for the passage of two or severalpairs of straps s 3 (two only are shown in the drawings) overlappingeach other and having for their object, as already stated, to preventthe edges'of the india-rubber cylinder e e from protruding between theflanges f f of the steel or other metal sheet, and hence the device frombeing properly closed. The handles h h have each a rectangular shankcarrying a central screw to befixed in the tapped perforationp p, abovementioned, these shanks having rectangular openings 0 0, through whichis passed a curved rack R. The opening 0' acts as a catch or pawl toenter the teeth of the said rack R, which is pivoted in the opening 0 ofthe other bar h. The flanges ff are furnished with perforations formedat difierent intervals opposite one another to receive suitable bolts.XVhen a leakage occurs -in a pipe, the india-rubber split cylinder isplaced around the same and the steel sheet is made to inclose thelatter, while the bandles being screwed on the parts B B are press-.

ed or squeezed together by hand to bring the flanges in sufficientlyclose contact for bolting, the straps assisting in the meanwhile inkeeping the edges of the india-rubber cylinder in position. fromseparating while being bolt-ed by reason of the catch formed in theopening 0 enter- The flanges are prevented.

mg successlvely between the teeth of the rack R as the handles are beingfirmly tightened. The bolts having now been passed through theirrespective perforations in flanges ff are tightened by suitable nuts,and when the loo a metallic cylindrical casing or envelope provided withflanges secured by belts, with vertical bars, overlapping straps, andremovable handles, substantially as and for the purpose described.

J. LA\VRENCE.

Witnesses:

ALEXANDER J AMES ELI, FRANK HUGHES,

To Clzrmcery Lane, London, IV. C.

